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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04b5f7adb08c2ab49052246212f2781f22716a1f8f1c820e53a32ba33442f8ba' 
  AND token = 'g6ZqQF6X3RXY6z4FycgNmNy4x4oM84crDIn1nR5ujx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}